[DML] Re: Strange acceleration problem ( For Rob Grady)
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[DML] Re: Strange acceleration problem ( For Rob Grady)


I too have a very similar experience when I Start my engine cold and then immediately try 
to take off at a quick pace without letting the car warm up for a minute.  As I get to a 
certain rpm under acceleration the engine will suddenly fall off and backfire pretty loud.  I 
let up on the accelerator a bit so it stops and continue at a less agressive pace. it usually 
only happens once when cold. it generally goes away a half mile further down the road.

I replaced my fuel filter 4-5 years ago and even then my fuel system was quite clean inside 
the tank.  I was in their this spring and everything was quite good. I could understand  
changing the filter if you went into the tank found rust and disintragated rubber 
everywhere.  But mine is clean. I won't rule out changing it, but I would like to know what 
the other things are I should look for the other 40% of the time.

One thing I should also point out is that I have  the Houston exhaust which does not have 
provisions for the heat riser duct . I just have the pipe tucked loosely on top of the right 
header so it can draw in any heat heat generated in the area. 

Other than this, the car runs perfectly. It always starts instantly and idles smooth @ 775 
unless it is really cold say less than 50 degrees out then it might idle hunt a little for 3-4 
ups and downs before being constant.

On a diffenet note:

I have a friend who's car will not hot start, even if he just turned it off and goes to restart. 
Although it will restart if you do the CPR connector swap on the cold start valve. I was 
under the car a month ago and did a test where we ran the car with the  small return line 
running into a jar to see if the accumulator was bad.  After the initial start-up 
pressurization of the system, which of coarse pushed fuel out of the spring side of the 
accumulator, the flow almost stopped but did continue to drip albeit very slowly  but was 
constant. I just can't imagine that this would make the car not restart after shutting it off 5 
seconds earlier. He has replaced the fuel pump and the O-rings in the fuel distibutor. The 
only thing left is the accumulator ,which he has, but hasn't gotten around to changing yet. 
Are their any other possilities? 

 He also has cold weather hesitation although it is much different than my symptoms. His 
car will stumble slightly when  when accelerating say for the first 10 minutes after the car 
has been started cold. it feels more like a mis in the engine than an all out lean situation 
he's done an ignition tune up with no change. He runs a can of B-12 thru it every few 
months, with no change. I even swapped my CPR for his to try see if that might be the 
problem. no change their either accept he thought the car didn't accelerate as well with my 
unit than his. so we switched them back, and his car ran fine again. My car runs fine with 
my CPR so I'm not sure what the deal is their either.Many times he has to depress the 
accelerator half way to the floor and then it will eventually start. His car has been that way 
since he's owned it (5 years) it almost acts like it's flooded. On the other hand my car 
always starts immediatley by just turning the key. We have been chasing this mystery quite 
some time now.

Rob, any suggestions would grately appreciated. 


--- In dmcnews@xxxxxxxxxxxxxxx, <rob@xxxx> wrote:
> Dan,
> Before you try to trouble shoot the fuel injection I would suggest changing
> the fuel filter. That corrects the symptoms you describe more than half of
> the time. Do you know when it was last changed? A bad CPR won't allow you to
> accelerate at all for a few minutes with a cold engine so I doubt it's that.
> Rob Grady
> P.J.Grady Inc.
> -----Original Message-----
> From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
> Daniel
> Sent: Wednesday, October 19, 2005 4:43 PM
> To: dmcnews@xxxxxxxxxxxxxxx
> Subject: [DML] Strange acceleration problem
> Here is something ponder over. When I start my car after sitting for
> the night it starts up fine. When I give it gas to get out of my
> driveway and up the street, I notice I lose acceleration. I then here
> a slight backfire in about 3-4 quicks pops. After this the car runs
> fine and I don't get it again until the next day after sitting
> overnight. Any thoughts on the cause of this? Thanks!
> -Dan

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